(19)
(11) EP 0 889 570 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.02.2000 Bulletin 2000/08

(43) Date of publication A2:
07.01.1999 Bulletin 1999/01

(21) Application number: 98112080.1

(22) Date of filing: 30.06.1998
(51) International Patent Classification (IPC)7: H02J 1/02, H02J 7/34, H01M 10/40
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 30.06.1997 JP 17365997

(71) Applicant: NEC CORPORATION
Tokyo (JP)

(72) Inventors:
  • Nishiyama, Toshihiko
    Minato-ku, Tokyo (JP)
  • Sakata, Kouji
    Minato-ku, Tokyo (JP)
  • Kurihara, Junko
    Minato-ku, Tokyo (JP)
  • Harada, Gaku
    Minato-ku, Tokyo (JP)

(74) Representative: von Samson-Himmelstjerna, Friedrich R., Dipl.-Phys. et al
SAMSON & PARTNER Widenmayerstrasse 5
80538 München
80538 München (DE)

   


(54) Power supply circuit


(57) A power supply device of the present invention includes an electric double layer capacitor (2) connected to, e.g., an HDD (Hard Disk Drive), CD-ROM (Compact Disk Read Only Memory) drive, floppy disk drive or similar motor-driven equipment (1), and another electric double layer capacitor (2) connected to, e.g. a pulse generating device (3) included in a radio transmitter. The capacitors (2) each feed power when the load of the associated equipment sharply varies during operation of the equipment. This makes it needless for a main power supply (5) to feed such power. A laminate polymer battery (4) is connected to a low voltage IC (Integrated Circuit) (7) and feeds power thereto. This also makes it needless for the main power (5) to feed power to the low voltage IC (7), and allows a short feed line to connect the laminate polymer battery (4) and IC (7). The short feed line reduces the transfer of noise to the IC (7) and therefore malfunction ascribable to noise.






Search report